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Rotation Direction
The exterior of the gearbox is completely symmetrical; however, it is NOT symmetrical internally. Depending on the orientation of the gearbox, the bevel gear on the output shaft could be on either side which will affect the rotation direction.
Before installing the gearbox, check the rotation direction by hand and orient it in the direction that produces the desired rotation direction.

Orientation A

Bevel gears on right side of gearbox
Bevel gears on right side of gearbox - rotation directions

Orientation B

Bevel gears on left side of gearbox
Bevel gears on left side of gearbox - rotation directions
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Orientation A
Orientation B